I think Burks will primarily be useful just because he'll cut down the amount of time we see Exum/Burke backcourts play together.
My concern about Burks as a bench guy, and this might just be because he was trying to learn a new offensive system, is that he was pretty terrible as the 1st option scorer in the 2nd unit. His efficiency was way down in this role for what ever reason and he played much better when playing with the starters. Not sure Burks is the offensive stud we all think he is. he's gotta get more efficient when he's the #1 offensive guy on the floor. He's got to get to 2013-14 Ginobili status.
Alec is one of the only players that can go get a bucket and nobody can do anything about it.